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CN107000583A - Charge pipe and its manufacture method - Google Patents

Charge pipe and its manufacture method Download PDF

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Publication number
CN107000583A
CN107000583A CN201680004022.2A CN201680004022A CN107000583A CN 107000583 A CN107000583 A CN 107000583A CN 201680004022 A CN201680004022 A CN 201680004022A CN 107000583 A CN107000583 A CN 107000583A
Authority
CN
China
Prior art keywords
charge pipe
fuel tank
layer
bellows
peripheral mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201680004022.2A
Other languages
Chinese (zh)
Other versions
CN107000583B (en
Inventor
福安智之
下条诚
宫岛敦夫
畠中树
畠中一树
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Riko Co Ltd
Original Assignee
Sumitomo Riko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Riko Co Ltd filed Critical Sumitomo Riko Co Ltd
Priority claimed from PCT/JP2016/075783 external-priority patent/WO2017056846A1/en
Publication of CN107000583A publication Critical patent/CN107000583A/en
Application granted granted Critical
Publication of CN107000583B publication Critical patent/CN107000583B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/04—Tank inlets
    • B60K15/0406—Filler caps for fuel tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/04—Tank inlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/224—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length having a profiled section, e.g. tubes, rods
    • B29C43/226—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length having a profiled section, e.g. tubes, rods having a corrugated section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/0015—Making articles of indefinite length, e.g. corrugated tubes
    • B29C49/0021—Making articles of indefinite length, e.g. corrugated tubes using moulds or mould parts movable in a closed path, e.g. mounted on movable endless supports
    • B29C49/0022—Making articles of indefinite length, e.g. corrugated tubes using moulds or mould parts movable in a closed path, e.g. mounted on movable endless supports characterised by mould return means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02—Belling or enlarging, e.g. combined with forming a groove
    • B29C57/04—Belling or enlarging, e.g. combined with forming a groove using mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/06—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions for securing layers together; for attaching the product to another member, e.g. to a support, or to another product, e.g. groove/tongue, interlocking
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/263—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer having non-uniform thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B29K2023/0608—PE, i.e. polyethylene characterised by its density
    • B29K2023/065—HDPE, i.e. high density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/08—Copolymers of ethylene
    • B29K2023/086—EVOH, i.e. ethylene vinyl alcohol copolymer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/18—Pleated or corrugated hoses
    • B29L2023/183—Pleated or corrugated hoses partially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
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    • B32B2307/712—Weather resistant
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    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2597/00—Tubular articles, e.g. hoses, pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/04—Tank inlets
    • B60K2015/0458—Details of the tank inlet
    • B60K2015/047—Manufacturing of the fuel inlet or connecting elements to fuel inlet, e.g. pipes or venting tubes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Manufacturing & Machinery (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

本发明提供一种能够在确保熔接面的熔接强度和耐燃料透过特性的同时，适当地满足与波纹管部和非波纹形筒状的基本部相应的要求功能的加料管。加料管(30)包括：基本部(31)，其总壁厚为2mm～4mm，呈非波纹形筒状；波纹管部(32)，其总壁厚为0.5mm～3mm；以及凸缘部(35)，其总壁厚为3.5mm～5mm，且具有能熔接于燃料箱(10)的端面。基本部(31)、波纹管部(32)以及凸缘部(35)包括：内层(31a、32a、35a)，其形成为总壁厚的40％～60％的厚度且将高密度聚乙烯(HDPE)作为主体；中间层(31b、32b、35b)，其具有耐燃料透过特性；以及外层(31c、32c、35c)，其用于保护中间层(31b、32b、35b)。

The present invention provides a feed pipe capable of properly satisfying required functions corresponding to a bellows portion and a non-corrugated cylindrical base portion while ensuring the weld strength and fuel permeation resistance of the welded surface. The feeding pipe (30) includes: a basic part (31), with a total wall thickness of 2 mm to 4 mm, in a non-corrugated cylindrical shape; a bellows part (32), with a total wall thickness of 0.5 mm to 3 mm; and a flange part (35), the total wall thickness of which is 3.5 mm to 5 mm, and has an end face capable of being welded to the fuel tank (10). The base part (31), the bellows part (32) and the flange part (35) include: an inner layer (31a, 32a, 35a) formed to a thickness of 40% to 60% of the total wall thickness and made of high-density poly Ethylene (HDPE) as the main body; middle layer (31b, 32b, 35b) having fuel permeation resistance; and outer layer (31c, 32c, 35c) for protecting the middle layer (31b, 32b, 35b).

Description

加料管和其制造方法Feeding tube and method of manufacturing the same

技术领域technical field

本发明涉及加料管和其制造方法。The present invention relates to a feed tube and a method for its manufacture.

背景技术Background technique

在日本特开2014－231286号公报中记载了将热塑性树脂的加料管的端面熔接在树脂制的燃料箱的开口部。该加料管在其熔接于燃料箱的端部具备凸缘部。此外，在日本特开2003－194280号公报中也记载了将加料管的端面熔接在燃料箱的开口部。该加料管的熔接部位与其他的部位相比形成为厚壁。此外，该加料管能够利用波纹成形做成厚壁。JP-A-2014-231286 describes welding an end surface of a thermoplastic resin feed pipe to an opening of a resin fuel tank. The filler pipe has a flange at its end welded to the fuel tank. In addition, JP-A-2003-194280 also describes welding the end surface of the feed pipe to the opening of the fuel tank. The welded portion of the feed pipe is thicker than other portions. In addition, the feed tube can be made thick-walled using corrugation.

在日本特许第5243904号公报中记载了能熔接在树脂制的燃料箱上的接合零件为了提高熔接性而使用高密度聚乙烯树脂(HDPE)。并且，记载了该接合零件为了获得耐燃料透过特性而使用含有HDPE的特殊的材料，不使用以往的乙烯-乙烯醇共聚物(EVOH)。由此，该接合构件能够使耐燃料透过特性和熔接性良好。Japanese Patent No. 5243904 discloses that high-density polyethylene resin (HDPE) is used for joining parts that can be welded to a fuel tank made of resin in order to improve weldability. In addition, it is described that a special material containing HDPE is used for the joining part in order to obtain fuel permeation resistance, and conventional ethylene-vinyl alcohol copolymer (EVOH) is not used. Accordingly, the joining member can have good fuel permeation resistance and weldability.

此外，在日本特许第3575754号公报中记载了一种可应用于管、箱等的结构物，该结构物包括HDPE的第一层、将EVOH作为主体的第二层、以及聚酰胺或者聚酰胺和聚烯烃的混合物的第三层。In addition, Japanese Patent No. 3575754 describes a structure applicable to pipes, tanks, etc., which includes a first layer of HDPE, a second layer mainly composed of EVOH, and polyamide or polyamide and a third layer of a mixture of polyolefins.

此外，在日本特开2015－55261号公报中记载了一种树脂制的加料管的制造方法。该制造方法通过进行利用波纹模具对由挤出成型机挤出来的筒状的原材料进行推压的波纹成形，来成形具备波纹管部和非波纹形筒状基本部的管。并且，利用冲压加工弯曲成形非波纹形筒状的基本部。In addition, JP-A-2015-55261 describes a method of manufacturing a resin feeding tube. In this manufacturing method, a tube having a bellows portion and a non-corrugated cylindrical base portion is molded by performing corrugation molding in which a cylindrical material extruded from an extrusion molding machine is pressed by a bellows die. And, the non-corrugated cylindrical base portion is bent and formed by press working.

发明内容Contents of the invention

发明要解决的问题The problem to be solved by the invention

在将加料管的端面熔接在燃料箱上的情况下，熔接强度成为重要的因素。熔接强度根据加料管的熔接面的平面状部分的面积、熔接面的材质以及该材质的厚度而有所不同。作为熔接面的材质，像日本特许第5243904号公报所记载的那样公知有优选为HDPE。When welding the end surface of the feed pipe to the fuel tank, welding strength becomes an important factor. The weld strength varies depending on the area of the planar portion of the welded surface of the feed pipe, the material of the welded surface, and the thickness of the material. As the material of the welded surface, it is known that HDPE is preferred as described in Japanese Patent No. 5243904 .

此外，加料管像日本特许第5243904号公报和日本特许第3575754号公报所记载的那样需要具有耐燃料透过特性。因此，使用日本特许第5243904号公报所记载的特殊的材质会导致高成本化。另一方面，若熔接面使用不特殊的HDPE，则例如像日本特许第3575754号公报所记载的那样需要设置承担EVOH等的耐燃料透过特性的层。但是，熔接面为了确保面积而形成为凸缘状，从而会导致耐燃料透过特性与形成熔接层的HDPE的层的厚度相应地降低。In addition, the feed pipe needs to have fuel permeation resistance as described in Japanese Patent No. 5243904 and Japanese Patent No. 3575754 . Therefore, use of the special material described in Japanese Patent No. 5243904 leads to high cost. On the other hand, if a non-specific HDPE is used for the welded surface, it is necessary to provide a layer that bears fuel permeation resistance properties such as EVOH, as described in Japanese Patent No. 3575754, for example. However, the welded surface is formed in a flange shape in order to secure an area, and the fuel permeation resistance property decreases according to the thickness of the HDPE layer forming the welded layer.

此外，例如像日本特开2015－55261号公报所记载的那样，加料管除了具备熔接面之外还具备波纹管部和非波纹形筒状的基本部。除了熔接面的熔接性能之外，波纹管部、基本部也各自都有所要求的功能。例如，波纹管部是为了配设容易化而需要的。非波纹形筒状的基本部例如需要具有耐冲击性。In addition, for example, as described in JP 2015-55261 A, the feeding tube includes a bellows portion and a non-corrugated cylindrical base portion in addition to the welded surface. In addition to the welding performance of the welding surface, the bellows part and the base part also have required functions. For example, the bellows portion is required for ease of arrangement. The non-corrugated cylindrical base part needs to have impact resistance, for example.

本发明的目的在于提供能够在确保熔接面的熔接强度和耐燃料透过特性的同时，适当地满足与波纹管部和非波纹形筒状的基本部相应的要求功能的加料管和其制造方法。An object of the present invention is to provide a feed pipe and a method of manufacturing the same, which can properly satisfy the required functions corresponding to the corrugated pipe part and the non-corrugated cylindrical basic part while ensuring the weld strength and fuel permeation resistance of the welded surface. .

用于解决问题的方案solutions to problems

(1.加料管)(1. Feeding tube)

本发明的加料管是能熔接在燃料箱的开口部的热塑性树脂制的加料管。熔接之前的所述加料管包括：基本部，其总壁厚为2mm～4mm，呈非波纹形筒状；波纹管部，其总壁厚为0.5mm～3mm；以及凸缘部，其总壁厚为3.5mm～5mm，且具有能熔接于所述燃料箱的端面。The filler pipe of the present invention is a thermoplastic resin filler pipe that can be welded to the opening of the fuel tank. The feeding pipe before welding includes: a basic part, the total wall thickness of which is 2 mm to 4 mm, in a non-corrugated cylindrical shape; a bellows part, whose total wall thickness is 0.5 mm to 3 mm; and a flange part, whose total wall thickness The thickness is 3.5mm-5mm, and it has an end face that can be welded to the fuel tank.

所述基本部、所述波纹管部以及所述凸缘部包括：内层，其形成为总壁厚的40％～60％的厚度且将高密度聚乙烯(HDPE)作为主体；中间层，其配置在所述内层的外周侧且具有耐燃料透过特性；以及外层，其配置在所述中间层的外周侧，用于保护所述中间层。The base portion, the bellows portion, and the flange portion include: an inner layer formed to a thickness of 40% to 60% of a total wall thickness and mainly made of high-density polyethylene (HDPE); an intermediate layer, It is disposed on the outer peripheral side of the inner layer and has fuel permeation resistance; and an outer layer is disposed on the outer peripheral side of the intermediate layer for protecting the intermediate layer.

HDPE与树脂制的燃料箱之间的熔接性能良好。而且，凸缘部的总壁厚是3.5mm～5mm，具有总壁厚的40％以上的厚度的内层形成为将HDPE作为主体。凸缘部的内层是位于端面、与燃料箱接触的部位。也就是说，凸缘部的内层具有能够确保所需要的熔接强度的程度的厚度。The welding performance between HDPE and the fuel tank made of resin is good. Furthermore, the total thickness of the flange portion is 3.5 mm to 5 mm, and the inner layer having a thickness of 40% or more of the total thickness is formed mainly from HDPE. The inner layer of the flange part is located at the end surface and is in contact with the fuel tank. That is, the inner layer of the flange portion has a thickness sufficient to ensure the required weld strength.

此外，在凸缘部中，存在于燃料箱的表面和凸缘部的中间层之间的内层与中间层相比，耐燃料透过特性较低。但是，凸缘部的内层是内层的总壁厚的60％以下的厚度。因而，在凸缘部的内层熔接于燃料箱的状态下，凸缘部的内层的厚度足够小。因此，能够在凸缘部的内层的部位充分地确保耐燃料透过特性。In addition, in the flange portion, the inner layer present between the surface of the fuel tank and the intermediate layer of the flange portion has lower fuel permeation resistance properties than the intermediate layer. However, the inner layer of the flange portion has a thickness of 60% or less of the total thickness of the inner layer. Therefore, in a state where the inner layer of the flange portion is welded to the fuel tank, the thickness of the inner layer of the flange portion is sufficiently small. Therefore, sufficient fuel permeation resistance can be ensured at the inner layer of the flange portion.

此外，基本部将其总壁厚形成为2mm～4mm。因而，基本部可靠地具有所要求的耐冲击性。另一方面，波纹管部将其总壁厚形成为0.5mm～3mm。也就是说，波纹管部薄于基本部。因此，波纹管部具有良好的弯曲性，因此能够使加料管的配设容易化。但是，由于波纹管部的总壁厚薄于基本部的总壁厚，因此该波纹管部的耐冲击性能较低。但是，通过在不那么需要耐冲击性的位置且是要求弯曲配置的位置处配置波纹管部就足矣。In addition, the base portion is formed to have a total wall thickness of 2 mm to 4 mm. Therefore, the base portion reliably has the required impact resistance. On the other hand, the bellows portion has a total thickness of 0.5 mm to 3 mm. That is, the bellows portion is thinner than the base portion. Therefore, since the bellows portion has good bendability, it is possible to facilitate arrangement of the feeding tube. However, since the total wall thickness of the bellows portion is thinner than that of the base portion, the bellows portion has low impact resistance. However, it is sufficient to dispose the bellows portion at a position where impact resistance is not so required and where a bent arrangement is required.

(2.加料管的制造方法)(2. Manufacturing method of feeding tube)

作为制造方法的对象的加料管除了包括上述部分之外，还包括总壁厚4mm～6mm的非波纹状的厚壁筒部，所述凸缘部从所述厚壁筒部的靠所述燃料箱侧的一端向径向外侧突出。The feeding pipe as the object of the manufacturing method includes, in addition to the above-mentioned parts, a non-corrugated thick-walled cylindrical portion with a total wall thickness of 4 mm to 6 mm, and the flange portion extends from the thick-walled cylindrical portion near the fuel One end on the box side protrudes radially outward.

该加料管的制造方法包括：一次成形工序，在该工序中，使用波纹模具利用波纹成形来成形一次成形体；以及二次成形工序，在该工序中，通过使用外周模具和内周模具对所述一次成形体实施冲压加工来成形所述加料管。The method of manufacturing the feeding tube includes: a primary forming process in which a primary formed body is formed by corrugation using a corrugated mold; The primary formed body is subjected to press processing to form the feeding tube.

所述一次成形体包括所述基本部、所述波纹管部、所述厚壁筒部以及筒状的被成形部，该被成形部是扩张成形所述凸缘部之前的部位。The primary molded body includes the base portion, the bellows portion, the thick-walled cylindrical portion, and a cylindrical molded portion that is a portion before expanding and molding the flange portion.

所述二次成形工序包括：一次成形体配置工序，在该工序中，以设为预定温度的所述外周模具支承所述一次成形体的所述厚壁筒部的外周面的方式将所述一次成形体配置于所述外周模具；以及扩张成形工序，在该工序中，在所述一次成形体配置工序之后将设为比所述外周模具的所述预定温度高的温度的所述内周模具插入到所述被成形部的内周侧，并且，使所述外周模具和所述内周模具在轴线方向上相对移动而使所述外周模具的端面和所述内周模具在轴线方向上夹持所述被成形部，从而扩张成形所述凸缘部。The secondary molding process includes a primary molded body arranging step in which the outer peripheral mold set at a predetermined temperature supports the outer peripheral surface of the thick-walled cylindrical portion of the primary molded body. a primary molded body is arranged in the outer peripheral mold; and an expansion molding step of setting the inner periphery at a temperature higher than the predetermined temperature of the outer peripheral mold after the primary molded body arranging step. A mold is inserted into the inner peripheral side of the part to be formed, and the outer peripheral mold and the inner peripheral mold are relatively moved in the axial direction so that the end surface of the outer peripheral mold and the inner peripheral mold are axially aligned. The portion to be formed is sandwiched to expand and shape the flange portion.

采用上述制造方法，通过将一次成形体的筒状的被成形部扩张成形，能够成形凸缘部。此时，使用支承加料管外周侧的外周模具和支承加料管内周侧的内周模具。在此，在扩张成形工序中，内周模具被设为其温度比外周模具的温度高。也就是说，一次成形体的被成形部被内周模具加温，成为易于扩张成形的状态。According to the above manufacturing method, the flange portion can be formed by expanding and forming the cylindrical portion to be formed of the primary formed body. At this time, an outer peripheral die supporting the outer peripheral side of the feeding tube and an inner peripheral die supporting the inner peripheral side of the feeding tube are used. Here, in the expansion molding step, the temperature of the inner peripheral mold is set to be higher than that of the outer peripheral mold. That is, the part to be formed of the primary molded body is heated by the inner peripheral mold, and is in a state where it is easy to be expanded and molded.

另一方面，外周模具在扩张成形工序中比内周模具的温度低。该外周模具是在扩张成形工序之前供一次成形体配置的模具。也就是说，在扩张成形工序中，即使内周模具相对地设为高温，由于外周模具是低温，因此，一次成形体的与外周模具接触的部位也不会成为易于变形的状态，外周模具和一次成形体之间的相对位置不易产生偏移。因而，能够在期望的位置扩张成形凸缘部。On the other hand, the temperature of the outer peripheral mold is lower than that of the inner peripheral mold in the expansion molding step. The peripheral die is a die for disposing the primary molded body before the expansion molding step. That is to say, in the expansion molding process, even if the inner peripheral mold is relatively high temperature, since the outer peripheral mold is low temperature, the portion of the primary molded body in contact with the outer peripheral mold will not be easily deformed, and the outer peripheral mold and the outer peripheral mold will not be easily deformed. The relative position between the primary forming bodies is not easy to shift. Therefore, the flange portion can be expanded and molded at a desired position.

并且，凸缘部自厚壁筒部的靠燃料箱侧的一端与厚壁筒部连续地设置。而且，厚壁筒部的总壁厚是4mm～6mm，比基本部厚。因此，即使扩张成形凸缘部，凸缘部和厚壁筒部之间的交界部位也能够维持具有足够强度的状态。In addition, the flange portion is continuously provided from one end of the thick cylindrical portion on the fuel tank side to the thick cylindrical portion. Furthermore, the total wall thickness of the thick cylindrical portion is 4 mm to 6 mm, which is thicker than that of the basic portion. Therefore, even if the flange portion is expanded and formed, the boundary portion between the flange portion and the thick cylindrical portion can maintain a state having sufficient strength.

附图说明Description of drawings

图1是燃料管线的图。Figure 1 is a diagram of a fuel line.

图2是图1的加料管的轴线方向剖视图，是直线状的状态的加料管的图。Fig. 2 is an axial sectional view of the feeding pipe of Fig. 1 , showing the feeding pipe in a linear state.

图3是图1的基本部的放大轴线方向剖视图。Fig. 3 is an enlarged axial sectional view of a basic part of Fig. 1 .

图4是图1的波纹管部的放大轴线方向剖视图。Fig. 4 is an enlarged axial sectional view of the bellows portion in Fig. 1 .

图5是图1的厚壁筒部的放大轴线方向剖视图。Fig. 5 is an enlarged axial sectional view of the thick cylindrical portion of Fig. 1 .

图6是图1的凸缘部的放大轴线方向剖视图。Fig. 6 is an enlarged axial sectional view of the flange portion in Fig. 1 .

图7是表示加料管的制造方法的流程图。Fig. 7 is a flowchart showing a method of manufacturing the feed tube.

图8是扩张成形图2所示的加料管之前的一次成形体的放大轴线方向剖视图。Fig. 8 is an enlarged axial cross-sectional view of the primary molded body before expanding the feeding tube shown in Fig. 2 .

图9是表示图7中的S3的一次成形体配置工序的图。FIG. 9 is a diagram showing a primary compact arrangement step in S3 in FIG. 7 .

图10是表示图7中的S4的加温工序的图。FIG. 10 is a diagram showing a heating step in S4 in FIG. 7 .

图11是表示图7中的S5的扩张成形工序的图。FIG. 11 is a diagram showing the expansion forming step of S5 in FIG. 7 .

具体实施方式detailed description

(1.燃料管线1的结构)(1. Structure of fuel line 1)

参照图1说明燃料管线1的结构。燃料管线1是在汽车中从供油口到内燃机(未图示)的管线。其中，在本实施方式中说明从供油口20到燃料箱10的部分。The structure of the fuel line 1 will be described with reference to FIG. 1 . The fuel line 1 is a line from a fuel supply port to an internal combustion engine (not shown) in an automobile. However, in this embodiment, the part from the fuel supply port 20 to the fuel tank 10 is demonstrated.

燃料管线1包括燃料箱10、供油口20、加料管30以及通气管线40。燃料箱10利用热塑性树脂成形，用于贮存汽油等液体燃料。贮存在燃料箱10中的液体燃料被向未图示的内燃机供给，用于驱动内燃机。供油口20设置在能够供供油嘴(未图示)插入的汽车外表面附近。在供油口20上安装有未图示的供油盖。在燃料箱10的侧面形成有燃料供给用的开口部11。The fuel line 1 includes a fuel tank 10 , a fuel supply port 20 , a feed pipe 30 and a vent line 40 . The fuel tank 10 is formed of thermoplastic resin and used to store liquid fuel such as gasoline. The liquid fuel stored in the fuel tank 10 is supplied to an internal combustion engine (not shown) to drive the internal combustion engine. The oil supply port 20 is provided near the outer surface of the vehicle into which a fuel supply nipple (not shown) can be inserted. An oil supply cap (not shown) is attached to the oil supply port 20 . An opening 11 for fuel supply is formed on a side surface of the fuel tank 10 .

加料管30利用热塑性树脂成形，将供油口20和燃料箱10之间连接起来。加料管30的一端熔接于燃料箱10的开口部11。在加料管30的另一端压入有供油口20的插入部21。将供油嘴插入供油口20中，并从供油嘴供给液体燃料，从而液体燃料经过加料管30并被贮存在燃料箱10中。在此，当在燃料箱10中加满液体燃料时，液体燃料会贮存在加料管30中，液体燃料触碰到供油嘴的顶端，从而自动地停止由供油嘴供给液体燃料。另外，加料管30在其全长的范围内成形为一体。The filler pipe 30 is formed of thermoplastic resin, and connects the fuel supply port 20 and the fuel tank 10 . One end of the feed pipe 30 is welded to the opening 11 of the fuel tank 10 . The insertion part 21 of the oil supply port 20 is press-fitted into the other end of the feed pipe 30 . A fuel supply nipple is inserted into the fuel supply port 20 and liquid fuel is supplied from the fuel supply nipple so that the liquid fuel passes through the feed pipe 30 and is stored in the fuel tank 10 . Here, when the liquid fuel is filled in the fuel tank 10, the liquid fuel is stored in the charging pipe 30, and the liquid fuel touches the tip of the fuel supply nozzle, thereby automatically stopping the liquid fuel supply from the fuel supply nozzle. In addition, the feed pipe 30 is integrally formed over its entire length.

通气管线40将燃料箱10和供油口20连接起来。通气管线40是用于在经由加料管30向燃料箱10供给液体燃料时将燃料箱10内的燃料的蒸气排出到燃料箱10之外的管线。The breather line 40 connects the fuel tank 10 and the fuel supply port 20 . The vent line 40 is a line for discharging vapor of the fuel in the fuel tank 10 to the outside of the fuel tank 10 when liquid fuel is supplied to the fuel tank 10 via the filling pipe 30 .

通气管线40包括切断阀装置41、连接器42以及通气管43。切断阀装置41配置在燃料箱10的上部，在切断阀装置41处于开放状态时，燃料箱10内的燃料的蒸气被向供油口20侧排出。切断阀装置41具备金属制的连接管41a。连接器42连结于连接管41a。该连接器42例如包括自日本特许第3775656号公报等所述的连接器去除流量控制阀后的结构。也就是说，连接器42被设置成能够相对于连接管41a装卸。通气管43将连接器42和供油口20连接起来。The ventilation line 40 includes a shut-off valve device 41 , a connector 42 and a ventilation tube 43 . The shutoff valve device 41 is disposed on the upper portion of the fuel tank 10 , and when the shutoff valve device 41 is in an open state, fuel vapor in the fuel tank 10 is discharged to the fuel supply port 20 side. The shutoff valve device 41 includes a metal connecting pipe 41a. The connector 42 is connected to the connection pipe 41a. This connector 42 includes, for example, a structure in which a flow control valve is removed from the connector described in Japanese Patent No. 3775656 or the like. That is, the connector 42 is provided so that attachment and detachment with respect to the connection pipe 41a are possible. The breather pipe 43 connects the connector 42 and the oil supply port 20 .

(2.加料管30的结构)(2. Structure of feeding pipe 30)

参照图1～图6说明加料管30的结构。如图1和图2所示，加料管30包括波纹管部32、锥形卡定部33、凸缘部35、非波纹形筒状的基本部31以及非波纹状的厚壁筒部34。基本部31、波纹管部32、锥形卡定部33、厚壁筒部34以及凸缘部35的总壁厚T1、T2、T4、T5如图3～图6所示。总壁厚按照厚壁筒部34、凸缘部35、基本部31、波纹管部32的顺序变薄。此外，如图3～图6所示，加料管30是由不同种类的热塑性树脂形成的多层结构。The structure of the feed pipe 30 will be described with reference to FIGS. 1 to 6 . As shown in FIGS. 1 and 2 , the feeding tube 30 includes a bellows portion 32 , a tapered locking portion 33 , a flange portion 35 , a non-corrugated cylindrical base portion 31 and a non-corrugated thick-walled cylindrical portion 34 . The total wall thicknesses T1, T2, T4, T5 of the base part 31, the bellows part 32, the tapered locking part 33, the thick-walled tube part 34 and the flange part 35 are shown in Figs. 3 to 6 . The total wall thickness becomes thinner in the order of the thick cylindrical portion 34 , the flange portion 35 , the base portion 31 , and the bellows portion 32 . In addition, as shown in FIGS. 3 to 6 , the feed pipe 30 is a multilayer structure formed of different kinds of thermoplastic resins.

基本部31形成为非波纹形筒状。即，基本部31形成为圆筒状或椭圆筒状。基本部31包括压入基本部61、非压入基本部62以及箱侧基本部63。The base portion 31 is formed in a non-corrugated cylindrical shape. That is, the base portion 31 is formed in a cylindrical shape or an elliptical cylindrical shape. The base portion 31 includes a press-fit base portion 61 , a non-press-fit base portion 62 , and a case-side base portion 63 .

压入基本部61在加料管30中设置在靠供油口20侧的一端(靠与燃料箱10所处侧相反的那一侧的一端)。压入基本部61形成为圆筒状。压入基本部61是供供油口20的插入部21压入于内部的部位。也就是说，压入基本部61与供油口20的插入部21压入之前的状态相比发生扩径。The press-fit base portion 61 is provided at an end on the fuel supply port 20 side (an end on a side opposite to the side where the fuel tank 10 is located) in the feed pipe 30 . The press-fit base portion 61 is formed in a cylindrical shape. The press-fit base part 61 is a part into which the insertion part 21 of the oil supply port 20 is press-fitted. That is, the press-fit base portion 61 is enlarged in diameter compared to the state before the insertion portion 21 of the oil supply port 20 is press-fitted.

非压入基本部62连接设置在压入基本部61的靠箱侧的一端。通过压入基本部61因插入部21的压入而扩开，从而非压入基本部62能够与压入基本部61区分开。但是，在压入基本部61因插入部21的压入而扩开之前的状态下，压入基本部61和非压入基本部62的直径相同，因此，无法区分两者，两者之间并不存在交界。The non-press-fit base part 62 is connected to one end of the press-fit base part 61 on the box side. The non-press-fit base portion 62 can be distinguished from the press-fit base portion 61 by expanding the press-fit base portion 61 due to the press-fitting of the insertion portion 21 . However, in the state before the press-fit base part 61 expands due to the press-fit of the insertion part 21, the diameters of the press-fit base part 61 and the non-press-fit base part 62 are the same, so the two cannot be distinguished. There is no border.

非压入基本部62从压入基本部61侧起依次包括第一直线部62a、弯曲部62b以及第二直线部62c。第一直线部62a连接设置在压入基本部61的靠燃料箱10侧的一端，其中心轴线形成为直线状，而且该第一直线部62a形成为圆筒状。弯曲部62b连接设置在第一直线部62a的靠燃料箱10侧的一端，其中心轴线形成为弯曲的形状，而且该弯曲部62b形成为椭圆筒状。第二直线部62c连接设置在弯曲部62b的靠燃料箱10侧的一端，其中心轴线形成为直线状，而且该第二直线部62c形成为圆筒状。也就是说，非压入基本部62的内周面形成为在中心轴线方向上不具有台阶的形状。因而，刚刚从供油嘴供给后的液体燃料顺畅地流通。The non-press-fit basic portion 62 includes a first linear portion 62a, a curved portion 62b, and a second linear portion 62c in this order from the press-fit basic portion 61 side. The first linear portion 62a is connected to one end of the press-fit base portion 61 on the side of the fuel tank 10, and its central axis is formed in a linear shape, and the first linear portion 62a is formed in a cylindrical shape. The curved portion 62b is connected to one end of the first linear portion 62a on the fuel tank 10 side, and its central axis is formed in a curved shape, and the curved portion 62b is formed in an elliptical cylindrical shape. The second straight portion 62c is connected to one end of the curved portion 62b on the side of the fuel tank 10, and its central axis is formed in a straight line, and the second straight portion 62c is formed in a cylindrical shape. That is, the inner peripheral surface of the non-press-fit base portion 62 is formed in a shape that does not have a step in the central axis direction. Therefore, the liquid fuel immediately after being supplied from the fuel supply nozzle flows smoothly.

箱侧基本部63隔着波纹管部32配置在非压入基本部62的燃料箱10侧。也就是说，箱侧基本部63连接设置在波纹管部32的靠燃料箱10侧的一端，其中心轴线形成为直线状，而且该箱侧基本部63形成为圆筒状。箱侧基本部63具备以环状向径向外侧突出的肋63a。箱侧基本部63具有连接波纹管部32和厚壁筒部34的作用。也就是说，箱侧基本部63具有缓和波纹管部32和厚壁筒部34的厚度的急剧变化的作用。特别是，由于箱侧基本部63具有肋63a，因而，即使箱侧基本部63的轴线方向长度较短，也能够可靠地缓和厚度的急剧变化。The tank-side base portion 63 is disposed on the fuel tank 10 side of the non-press-fit base portion 62 with the bellows portion 32 interposed therebetween. That is, the tank-side base portion 63 is connected to one end of the bellows portion 32 on the fuel tank 10 side, and its center axis is formed in a straight line, and the tank-side base portion 63 is formed in a cylindrical shape. The box-side base portion 63 includes a rib 63 a protruding radially outward in an annular shape. The tank-side base portion 63 has a role of connecting the bellows portion 32 and the thick-walled cylindrical portion 34 . That is, the tank-side base portion 63 has a function of alleviating sudden changes in thickness of the bellows portion 32 and the thick-walled cylindrical portion 34 . In particular, since the case-side base portion 63 has the rib 63a, even if the length of the case-side base portion 63 in the axial direction is short, a sudden change in thickness can be reliably moderated.

基本部31的轴线方向截面如图3所示。为了满足基本部31的耐冲击性，基本部31的总壁厚T1设为2mm～4mm。基本部31包括内层31a、中间层31b、外层31c、将内层31a和中间层31b粘接起来的内粘接层31d、以及将中间层31b和外层31c粘接起来的外粘接层31e。An axial cross section of the base portion 31 is shown in FIG. 3 . In order to satisfy the impact resistance of the base portion 31, the total thickness T1 of the base portion 31 is set to 2 mm to 4 mm. The base part 31 includes an inner layer 31a, an intermediate layer 31b, an outer layer 31c, an inner adhesive layer 31d for bonding the inner layer 31a and the intermediate layer 31b, and an outer adhesive layer for bonding the intermediate layer 31b and the outer layer 31c. Layer 31e.

由于内层31a是触碰液体燃料的面，因此，内层31a使用具有耐汽油性材料。并且，在供油口20的插入部21压入到压入基本部61的状态下，需要压入基本部61的内层31a具有针对插入部21而言的勾卡力(防脱力)。因此，基本部31的内层31a使用具有密封性的材料。因此，内层31a形成为将高密度聚乙烯(HDPE)作为主体。内层31a形成为基本部31的总壁厚T1的40％～60％的厚度。Since the inner layer 31a is a surface that touches liquid fuel, a gasoline-resistant material is used for the inner layer 31a. In addition, when the insertion portion 21 of the oil supply port 20 is press-fitted into the press-fit base portion 61 , the inner layer 31 a of the press-fit base portion 61 needs to have a hooking force (release preventing force) for the insertion portion 21 . Therefore, an airtight material is used for the inner layer 31a of the base portion 31 . Therefore, the inner layer 31a is formed mainly using high-density polyethylene (HDPE). The inner layer 31 a is formed to have a thickness of 40% to 60% of the total thickness T1 of the base portion 31 .

中间层31b配置在内层31a的外周侧，其具有耐燃料透过特性。中间层31b形成为，作为具有耐燃料透过特性的材料，将乙烯-乙烯醇共聚物(EVOH)和聚酰胺(PA)系中的任一者作为主体。中间层31b形成为总壁厚T1的1％～10％的厚度。The intermediate layer 31b is disposed on the outer peripheral side of the inner layer 31a, and has fuel permeation resistance. The intermediate layer 31 b is formed mainly of any one of ethylene-vinyl alcohol copolymer (EVOH) and polyamide (PA) as a material having fuel permeation resistance properties. The intermediate layer 31b is formed to have a thickness of 1% to 10% of the total thickness T1.

外层31c配置在中间层31b的外周侧，其用于保护中间层31b。外层31c形成加料管30的最外表面。因此，外层31c使用具有耐冲击性、耐候性、耐化学品性的材料。因此，外层31c形成为将高密度聚乙烯(HDPE)和聚酰胺(PA)系中的任一者作为主体。外层31c形成为总壁厚T1的20％～40％的厚度。The outer layer 31c is arranged on the outer peripheral side of the intermediate layer 31b, and serves to protect the intermediate layer 31b. The outer layer 31c forms the outermost surface of the feed tube 30 . Therefore, a material having impact resistance, weather resistance, and chemical resistance is used for the outer layer 31c. Therefore, the outer layer 31c is mainly formed of any one of high-density polyethylene (HDPE) and polyamide (PA). The outer layer 31c is formed to have a thickness of 20% to 40% of the total thickness T1.

内粘接层31d是用于将内层31a的外周面和中间层31b的内周面粘接起来的层。外粘接层31e是用于将中间层31b的外周面和外层31c的内周面粘接起来的层。内粘接层31d和外粘接层31e形成为将改性聚乙烯(改性PE)作为主体。内粘接层31d和外粘接层31e形成为总壁厚T1的1％～10％的厚度。但是，在内层31a和中间层31b中的一者相对于另一者具有粘接性能的情况下，不需要内粘接层31d。此外，在中间层31b和外层31c中的一者相对于另一者具有粘接性能的情况下，不需要外粘接层31e。The inner adhesive layer 31d is a layer for bonding the outer peripheral surface of the inner layer 31a and the inner peripheral surface of the intermediate layer 31b. The outer adhesive layer 31e is a layer for bonding the outer peripheral surface of the intermediate layer 31b and the inner peripheral surface of the outer layer 31c. The inner adhesive layer 31d and the outer adhesive layer 31e are mainly formed of modified polyethylene (modified PE). The inner adhesive layer 31d and the outer adhesive layer 31e are formed to have a thickness of 1% to 10% of the total thickness T1. However, in the case where one of the inner layer 31a and the intermediate layer 31b has adhesive properties with respect to the other, the inner adhesive layer 31d is not required. Furthermore, in the case where one of the intermediate layer 31b and the outer layer 31c has adhesive properties with respect to the other, the outer adhesive layer 31e is not required.

波纹管部32与基本部31不同，形成为波纹筒状。波纹管部32设置在箱侧基本部63和非压入基本部62中的第二直线部62c之间。即，波纹管部32连接设置在第二直线部62c的一端(靠燃料箱10侧的一端)，而且连接设置在箱侧基本部63的一端(靠与燃料箱10所处侧相反的那一侧的一端)。波纹管部32是能够在作业人员的操作下容易弯曲变形的部位。The bellows portion 32 is different from the base portion 31 in that it is formed in a bellows cylindrical shape. The bellows portion 32 is provided between the tank-side base portion 63 and the second straight portion 62 c that is not pressed into the base portion 62 . That is, the bellows portion 32 is connected to one end of the second linear portion 62c (the end near the fuel tank 10 side), and is connected to one end of the tank-side basic portion 63 (the side opposite to the side where the fuel tank 10 is located). side end). The bellows portion 32 is a portion that can be easily bent and deformed by an operator.

波纹管部32的轴线方向截面如图4所示。为了使波纹管部32具有良好的弯曲性(柔软性)，将波纹管部32的总壁厚T2设为0.5mm～3mm。而且，波纹管部32的总壁厚T2小于等于基本部31的总壁厚T1。也就是说，在第二直线部62c和波纹管部32之间的交界及箱侧基本部63和波纹管部32之间的交界，总壁厚发生变化。An axial cross section of the bellows portion 32 is shown in FIG. 4 . In order for the bellows part 32 to have good bendability (flexibility), the total thickness T2 of the bellows part 32 is set to 0.5 mm to 3 mm. Also, the total wall thickness T2 of the bellows portion 32 is equal to or smaller than the total wall thickness T1 of the base portion 31 . That is, the total wall thickness varies at the boundary between the second straight line portion 62c and the bellows portion 32 and the boundary between the tank-side base portion 63 and the bellows portion 32 .

波纹管部32与基本部31同样包括内层32a、中间层32b、外层32c、内粘接层32d以及外粘接层32e。波纹管部32的各层32a～32e由分别与基本部31的各层31a～31e相同的材料形成，各层32a～32e相对于总壁厚T2的比例也与基本部31中的对应的各层的比例相同。也就是说，内层32a的厚度是总壁厚T2的40％～60％，中间层32b的厚度是总壁厚T2的1％～10％，外层32c的厚度是总壁厚T2的20％～40％。在此，在加料管30中，波纹管部32是最薄的部位。因此，为了在加料管30全长的范围内确保耐燃料透过特性，与波纹管部32的总壁厚T2相应地设定中间层32b的厚度比例。The bellows portion 32 includes an inner layer 32a, an intermediate layer 32b, an outer layer 32c, an inner adhesive layer 32d, and an outer adhesive layer 32e similarly to the base portion 31 . The layers 32a to 32e of the bellows portion 32 are formed of the same material as the layers 31a to 31e of the base portion 31, and the ratios of the layers 32a to 32e to the total thickness T2 are also the same as those of the corresponding layers in the base portion 31. The scale of the layers is the same. That is to say, the thickness of the inner layer 32a is 40% to 60% of the total wall thickness T2, the thickness of the middle layer 32b is 1% to 10% of the total wall thickness T2, and the thickness of the outer layer 32c is 20% of the total wall thickness T2. %~40%. Here, in the feed tube 30, the bellows portion 32 is the thinnest portion. Therefore, the thickness ratio of the intermediate layer 32b is set according to the total thickness T2 of the bellows portion 32 in order to ensure the fuel permeation resistance property over the entire length of the feed pipe 30 .

锥形卡定部33形成为随着朝向燃料箱10侧去而扩径的锥形筒状。锥形卡定部33是发挥相对于后述的用于成形凸缘部35的外周模具80的卡定功能的部位。锥形卡定部33连接设置在箱侧基本部63的靠燃料箱10侧的一端。锥形卡定部33随着从箱侧基本部63到厚壁筒部34，其厚度以逐渐变厚的方式变化。另外，锥形卡定部33的轴线方向截面虽未详细地说明，但与基本部31实质上是同样的。The tapered locking portion 33 is formed in a tapered cylindrical shape whose diameter increases toward the fuel tank 10 side. The tapered locking portion 33 is a portion that performs a locking function with respect to an outer peripheral die 80 for forming the flange portion 35 described later. The tapered locking portion 33 is connected to one end of the tank-side base portion 63 on the fuel tank 10 side. The thickness of the tapered locking portion 33 gradually increases from the case-side base portion 63 to the thick cylindrical portion 34 . In addition, although the axial cross section of the tapered locking part 33 is not described in detail, it is substantially the same as that of the basic part 31 .

厚壁筒部34形成为非波纹形筒状。在本实施方式中，厚壁筒部34形成为圆筒状或椭圆筒状。厚壁筒部34连接设置在锥形卡定部33的靠燃料箱10侧的一端。厚壁筒部34形成为圆筒状，其连接设置于箱侧基本部63。在本实施方式中，与箱侧基本部63相比，厚壁筒部34的内径和外径均较大。The thick cylindrical portion 34 is formed in a non-corrugated cylindrical shape. In this embodiment, the thick-walled cylindrical portion 34 is formed in a cylindrical shape or an elliptical cylindrical shape. The thick-walled cylindrical portion 34 is connected to one end of the tapered locking portion 33 on the fuel tank 10 side. The thick cylindrical portion 34 is formed in a cylindrical shape, and is connected to the case-side base portion 63 . In the present embodiment, both the inner diameter and the outer diameter of the thick cylindrical portion 34 are larger than those of the tank-side base portion 63 .

厚壁筒部34的轴线方向截面如图5所示。厚壁筒部34为了在将凸缘部35熔接于燃料箱10时确保轴力(为了不发生纵向弯曲)，厚壁筒部34的总壁厚T4设为4mm～6mm。也就是说，厚壁筒部34比箱侧基本部63厚。A cross-section in the axial direction of the thick cylindrical portion 34 is shown in FIG. 5 . The thick cylindrical portion 34 has a total thickness T4 of 4 mm to 6 mm in order to secure the axial force (so as not to cause longitudinal bending) when the flange portion 35 is welded to the fuel tank 10 . That is, the thick-walled cylindrical portion 34 is thicker than the case-side base portion 63 .

厚壁筒部34与基本部31同样包括内层34a、中间层34b、外层34c、内粘接层34d以及外粘接层34e。厚壁筒部34的各层34a～34e由分别与基本部31的各层31a～31e相同的材料形成，各层34a～34e相对于总壁厚T4的比例也与基本部31中的相应的各层的比例相同。也就是说，内层34a的厚度是总壁厚T4的40％～60％，中间层34b的厚度是总壁厚T4的1％～10％，外层34c的厚度是总壁厚T4的20％～40％。The thick cylindrical portion 34 includes an inner layer 34a, an intermediate layer 34b, an outer layer 34c, an inner adhesive layer 34d, and an outer adhesive layer 34e similarly to the base portion 31 . The layers 34a to 34e of the thick-walled cylindrical portion 34 are formed of the same material as the layers 31a to 31e of the base portion 31, and the ratios of the layers 34a to 34e to the total wall thickness T4 are also the same as those in the base portion 31. The proportions of the layers are the same. That is to say, the thickness of the inner layer 34a is 40%-60% of the total wall thickness T4, the thickness of the middle layer 34b is 1%-10% of the total wall thickness T4, and the thickness of the outer layer 34c is 20% of the total wall thickness T4. %~40%.

凸缘部35自厚壁筒部34的靠燃料箱10侧的一端向径向外侧突出。这里所说的径向外侧并不是指仅是与厚壁筒部34的中心轴线正交的外方向，而是指具有该正交的外方向的成分的方向。凸缘部35包括锥形部71和圆环板部72。锥形部71随着从厚壁筒部34的靠燃料箱10侧的一端朝向燃料箱10去而扩径。也就是说，锥形部71从厚壁筒部34的一端向径向外侧扩展。圆环板部72从锥形部71的靠燃料箱10侧的一端向径向外侧延伸。圆环板部72具有能与燃料箱10相抵接并熔接于燃料箱10的端面。The flange portion 35 protrudes radially outward from one end of the thick cylindrical portion 34 on the fuel tank 10 side. The radially outer side here does not mean only the outward direction perpendicular to the central axis of the thick-walled cylindrical portion 34 , but means a direction having a component of the orthogonal outward direction. The flange portion 35 includes a tapered portion 71 and an annular plate portion 72 . The tapered portion 71 increases in diameter as it goes from the fuel tank 10 side end of the thick cylindrical portion 34 toward the fuel tank 10 . That is, the tapered portion 71 expands radially outward from one end of the thick cylindrical portion 34 . The annular plate portion 72 extends radially outward from one end of the tapered portion 71 on the fuel tank 10 side. The annular plate portion 72 has an end surface capable of contacting the fuel tank 10 and being welded to the fuel tank 10 .

凸缘部35的轴线方向截面如图6所示。凸缘部35的总壁厚T5设为3.5mm～5mm。其中，凸缘部35的总壁厚T5薄于厚壁筒部34的总壁厚T4。在此，凸缘部35像上述那样包括锥形部71和圆环板部72。也就是说，锥形部71的总壁厚T51和圆环板部72的总壁厚T52薄于厚壁筒部34的总壁厚T4。并且，圆环板部72的总壁厚T52薄于锥形部71的总壁厚T51。也就是说，按照厚壁筒部34、锥形部71、圆环板部72的顺序变薄。An axial cross section of the flange portion 35 is shown in FIG. 6 . The total thickness T5 of the flange portion 35 is set to 3.5 mm to 5 mm. However, the total thickness T5 of the flange portion 35 is thinner than the total thickness T4 of the thick cylindrical portion 34 . Here, the flange portion 35 includes the tapered portion 71 and the annular plate portion 72 as described above. That is, the total wall thickness T51 of the tapered portion 71 and the total wall thickness T52 of the annular plate portion 72 are thinner than the total wall thickness T4 of the thick-walled cylindrical portion 34 . Also, the total thickness T52 of the annular plate portion 72 is thinner than the total thickness T51 of the tapered portion 71 . That is, the thickness becomes thinner in the order of the thick cylindrical portion 34 , the tapered portion 71 , and the annular plate portion 72 .

凸缘部35(锥形部71和圆环板部72)与基本部31同样包括内层35a、中间层35b、外层35c、内粘接层35d以及外粘接层35e。凸缘部35的各层35a～35e由分别与基本部31的各层31a～31e相同的材料形成，各层35a～35e相对于总壁厚T5(T51、T52)的比例也与基本部31中的对应的各层的比例相同。也就是说，内层35a的厚度是总壁厚T5(T51、T52)的40％～60％，中间层35b的厚度是总壁厚T5(T51、T52)的1％～10％，外层35c的厚度是总壁厚T5(T51、T52)的20％～40％。The flange portion 35 (the tapered portion 71 and the annular plate portion 72 ) includes an inner layer 35a, an intermediate layer 35b, an outer layer 35c, an inner adhesive layer 35d, and an outer adhesive layer 35e similarly to the base portion 31 . The layers 35a to 35e of the flange portion 35 are formed of the same material as the layers 31a to 31e of the base portion 31, and the ratios of the layers 35a to 35e to the total thickness T5 (T51, T52) are also the same as those of the base portion 31. The proportions of the corresponding layers in are the same. That is to say, the thickness of the inner layer 35a is 40%～60% of the total wall thickness T5 (T51, T52), the thickness of the middle layer 35b is 1%～10% of the total wall thickness T5 (T51, T52), and the outer layer The thickness of 35c is 20%-40% of the total wall thickness T5 (T51, T52).

在此，凸缘部35的圆环板部72需要确保与燃料箱10之间的熔接强度。因此，凸缘部35的内层35a设为适合熔接的材料。也就是说，考虑到熔接性能，内层35a形成为将高密度聚乙烯(HDPE)作为主体。Here, the annular plate portion 72 of the flange portion 35 needs to secure the welding strength with the fuel tank 10 . Therefore, the inner layer 35a of the flange portion 35 is made of a material suitable for welding. That is, the inner layer 35a is formed mainly using high-density polyethylene (HDPE) in consideration of weldability.

而且，熔接强度取决于内层35a的厚度。因此，为了将内层35a的厚度设为具有所需要的熔接强度的厚度，将凸缘部35的总壁厚T5设为3.5mm～5mm，而且将内层35a设为总壁厚T5的40％以上。特别是，将圆环板部72的总壁厚T52设为3.5mm～5mm，而且将内层35a设为总壁厚T52的40％以上。Also, the weld strength depends on the thickness of the inner layer 35a. Therefore, in order to set the thickness of the inner layer 35a to have the required weld strength, the total thickness T5 of the flange portion 35 is set to 3.5mm to 5mm, and the inner layer 35a is set to 40% of the total thickness T5. %above. In particular, the total thickness T52 of the annular plate portion 72 is set to 3.5 mm to 5 mm, and the inner layer 35 a is set to be 40% or more of the total thickness T52.

其中，就耐燃料透过特性而言，由适合熔接的材料形成的内层35a比中间层35b差。而且，在凸缘部35的圆环板部72中，内层35a存在于燃料箱10的表面和凸缘部35的中间层35b之间。也就是说，内层35a划分出加料管30的液体燃料的流通区域和外部区域。因此，内层35a的厚度越薄，凸缘部35的圆环板部72的耐燃料透过特性越高。因此，通过将内层35a的厚度设为总壁厚T5(T52)的60％以下，能够确保熔接之后的耐燃料透过特性。Among them, the inner layer 35a formed of a material suitable for welding is inferior to the intermediate layer 35b in terms of resistance to fuel permeation. Also, in the annular plate portion 72 of the flange portion 35 , the inner layer 35 a exists between the surface of the fuel tank 10 and the intermediate layer 35 b of the flange portion 35 . That is, the inner layer 35a divides the liquid fuel circulation area and the outer area of the feed pipe 30 . Therefore, the thinner the inner layer 35a is, the higher the fuel permeation resistance property of the annular plate portion 72 of the flange portion 35 is. Therefore, by setting the thickness of the inner layer 35 a to 60% or less of the total thickness T5 ( T52 ), fuel permeation resistance after welding can be ensured.

(3.加料管30的制造方法)(3. Manufacturing method of feeding tube 30 )

参照图7的流程图和图8～图11说明加料管30的制造方法。首先，通过进行使用了波纹模具的挤出吹塑成形(波纹成形)，成形图8所示的一次成形体130(S1：“一次成形工序”)。Referring to the flowchart of FIG. 7 and FIGS. 8 to 11 , a method of manufacturing the feeding tube 30 will be described. First, the primary molded body 130 shown in FIG. 8 is molded by performing extrusion blow molding (corrugation molding) using a bellows die (S1: "primary molding process").

一次成形体130包括图2所示的基本部31、波纹管部32以及锥形卡定部33。并且，一次成形体130具备筒状的被成形部130a，该被成形部130a作为包含厚壁筒部34和凸缘部35的部分，且是扩张成形凸缘部35之前的部位。在此，一次成形体130的厚壁筒部34与图2所示的加料管30的厚壁筒部34相同。The primary molded body 130 includes a basic portion 31 , a bellows portion 32 and a tapered locking portion 33 shown in FIG. 2 . In addition, the primary molded body 130 includes a cylindrical molded portion 130 a that includes the thick cylindrical portion 34 and the flange portion 35 and is a portion before the flange portion 35 is expanded and formed. Here, the thick cylindrical portion 34 of the primary molded body 130 is the same as the thick cylindrical portion 34 of the feeding tube 30 shown in FIG. 2 .

被成形部130a与厚壁筒部34的厚度相同，且被成形部130a形成为与厚壁筒部34相同形状的圆筒状。其中，由于凸缘部35是将一次成形体130的被成形部130a扩张成形而成的，因此，凸缘部35的厚度薄于被成形部130a的厚度(与厚壁筒部34的厚度相等)。The portion to be formed 130 a has the same thickness as the thick cylindrical portion 34 , and the portion to be formed 130 a is formed in a cylindrical shape having the same shape as the thick cylindrical portion 34 . Wherein, since the flange portion 35 is formed by expanding the formed portion 130a of the primary molded body 130, the thickness of the flange portion 35 is thinner than the thickness of the formed portion 130a (equal to the thickness of the thick-walled cylindrical portion 34). ).

在此，一次成形体130的总壁厚因部位的不同而有所不同。而且，一次成形体130的各层的厚度也因部位的不同而有所不同。但是，由于一次成形体130是利用挤出吹塑成形而成形的，因此，无论是一次成形体130的哪个部位，一次成形体130的各层相对于总壁厚的比例都是大致相同的比例。例如，基本部31的内层31a相对于总壁厚T1的比例和波纹管部32的内层32a相对于总壁厚T2的比例大致相同。Here, the total wall thickness of the primary molded body 130 varies depending on the location. Furthermore, the thickness of each layer of the primary molded body 130 also varies depending on the location. However, since the primary molded body 130 is formed by extrusion blow molding, the ratio of each layer of the primary molded body 130 to the total wall thickness is approximately the same regardless of where the primary molded body 130 is located. . For example, the ratio of the inner layer 31a of the base portion 31 to the total thickness T1 is substantially the same as the ratio of the inner layer 32a of the bellows portion 32 to the total thickness T2.

接着，如图9所示，用于扩张成形凸缘部35的外周模具80和内周模具90安装在冲压装置主体(未图示)上(图7中的S2：“模具设置工序”)。在此，外周模具80用作下模，内周模具90用作上模。并且，外周模具80和内周模具90在上下方向上彼此离开。Next, as shown in FIG. 9 , the outer peripheral die 80 and inner peripheral die 90 for expanding and forming the flange portion 35 are attached to the press device main body (not shown) (S2 in FIG. 7: "die setting process"). Here, the outer peripheral mold 80 is used as a lower mold, and the inner peripheral mold 90 is used as an upper mold. And, the outer peripheral mold 80 and the inner peripheral mold 90 are separated from each other in the vertical direction.

外周模具80由多个分割模具构成，其整体形成为筒状。外周模具80的内周面包括圆筒内周面81、第一锥形面82以及第二锥形面83，第一锥形面82在圆筒内周面81的下方(远离内周模具90的一侧)与圆筒内周面81连续地形成，且越向下方去越缩径，第二锥形面83在圆筒内周面81的上方(接近内周模具90的一侧)与圆筒内周面81连续地形成，且越向上方去越扩径。The outer peripheral die 80 is composed of a plurality of split dies, and is formed in a cylindrical shape as a whole. The inner peripheral surface of the outer peripheral mold 80 includes a cylindrical inner peripheral surface 81, a first tapered surface 82 and a second tapered surface 83, and the first tapered surface 82 is below the cylindrical inner peripheral surface 81 (away from the inner peripheral mold 90 One side) is formed continuously with the inner peripheral surface 81 of the cylinder, and the diameter decreases further downwards, and the second tapered surface 83 is above the inner peripheral surface 81 of the cylinder (the side close to the inner peripheral mold 90 ) and The cylindrical inner peripheral surface 81 is formed continuously, and its diameter increases as it goes upward.

在此，圆筒内周面81与一次成形体130的厚壁筒部34相对应，与厚壁筒部34的外周面接触。第一锥形面82与一次成形体130的锥形卡定部33相对应，与锥形卡定部33的外周面接触。也就是说，第一锥形面82在与一次成形体130的锥形卡定部33接触的状态下，作为限制一次成形体130向图9中的下方移动的被卡定部发挥功能。因而，作为被卡定部的第一锥形面82在轴线方向上卡定于作为卡定部的锥形卡定部33。Here, the cylindrical inner peripheral surface 81 corresponds to the thick cylindrical portion 34 of the primary molded body 130 , and is in contact with the outer peripheral surface of the thick cylindrical portion 34 . The first tapered surface 82 corresponds to the tapered locking portion 33 of the primary molded body 130 and is in contact with the outer peripheral surface of the tapered locking portion 33 . That is, the first tapered surface 82 functions as a locked portion that restricts the downward movement of the primary molded body 130 in FIG. 9 while in contact with the tapered locking portion 33 of the primary molded body 130 . Therefore, the first tapered surface 82 as the locked portion is locked with the tapered locking portion 33 as the locking portion in the axial direction.

第二锥形面83位于与一次成形体130的被成形部130a相对应的轴线方向位置，其离开被成形部130a的外周面。第二锥形面83是用于成形扩张成形之后的凸缘部35的锥形部71的部位。The second tapered surface 83 is located at an axial position corresponding to the portion to be formed 130 a of the primary molded body 130 , and is separated from the outer peripheral surface of the portion to be formed 130 a. The second tapered surface 83 is a portion for forming the tapered portion 71 of the expanded flange portion 35 .

外周模具80的上端面(与内周模具90相对的面)包括在整周上位于外周侧的止挡平面84和在止挡平面84的内周侧在整周范围内形成为圆形的凹状的反熔接面形成部85。反熔接面形成部85与第二锥形面83连续地形成。此外，反熔接面形成部85的底面形成为与止挡平面84平行的平面状。反熔接面形成部85是用于成形扩张成形之后的凸缘部35的圆环板部72的反熔接面的部位。The upper end surface of the outer peripheral mold 80 (the surface opposite to the inner peripheral mold 90 ) includes a stopper plane 84 located on the outer peripheral side over the entire circumference and a concave shape formed circularly over the entire circumference on the inner peripheral side of the stopper plane 84 . The anti-welding surface forming part 85. The anti-welding surface forming portion 85 is formed continuously with the second tapered surface 83 . In addition, the bottom surface of the anti-welding surface forming portion 85 is formed in a planar shape parallel to the stopper plane 84 . The anti-welding surface forming portion 85 is a portion for forming the anti-welding surface of the annular plate portion 72 of the expanded flange portion 35 .

内周模具90包括主体部91、第一锥形面92、圆筒面93以及第二锥形面94，第一锥形面92自主体部91的中心向下方(外周模具80侧)去进行缩径并突出，圆筒面93从第一锥形面92的顶端以同轴状延伸而形成为圆筒状，第二锥形面94从圆筒面93的顶端以同轴状延伸并缩径。The inner peripheral mold 90 includes a main body portion 91, a first tapered surface 92, a cylindrical surface 93, and a second tapered surface 94. The first tapered surface 92 proceeds downward from the center of the main body portion 91 (outer peripheral mold 80 side). The diameter shrinks and protrudes, and the cylindrical surface 93 extends coaxially from the top end of the first tapered surface 92 to form a cylindrical shape, and the second tapered surface 94 extends coaxially from the top end of the cylindrical surface 93 and shrinks. path.

在此，主体部91具备熔接面形成部91a，熔接面形成部91a是与外周模具80的止挡平面84和反熔接面形成部85相对的面，用于形成凸缘部35的熔接面。熔接面形成部91a具有通过与止挡平面84接触来限制外周模具80和内周模具90的相对移动的功能。此外，熔接面形成部91a形成为在与止挡平面84接触的状态下在上下方向上离开反熔接面形成部85。Here, the main body portion 91 has a welded surface forming portion 91 a, which is a surface opposite to the stop plane 84 and the anti-welded surface forming portion 85 of the outer peripheral mold 80 , and is used to form the welded surface of the flange portion 35 . The welding surface forming portion 91 a has a function of restricting relative movement of the outer peripheral mold 80 and the inner peripheral mold 90 by contacting the stopper flat surface 84 . Further, the welded surface forming portion 91 a is formed to be separated from the anti-welded surface forming portion 85 in the up-down direction in a state of being in contact with the stopper flat surface 84 .

第一锥形面92是用于形成扩张成形之后的凸缘部35的锥形部71的部位。圆筒面93与一次成形体130的厚壁筒部34相对应，能与厚壁筒部34的内周面接触。第二锥形面94与一次成形体130的锥形卡定部33相对应，能与锥形卡定部33的内周面接触。The first tapered surface 92 is a site for forming the tapered portion 71 of the expanded flange portion 35 . The cylindrical surface 93 corresponds to the thick cylindrical portion 34 of the primary molded body 130 and can be in contact with the inner peripheral surface of the thick cylindrical portion 34 . The second tapered surface 94 corresponds to the tapered locking portion 33 of the primary molded body 130 and can be in contact with the inner peripheral surface of the tapered locking portion 33 .

接着，如图9所示，在模具配置工序之后将一次成形体130设置在外周模具80上(图7中的S3：“一次成形体配置工序”)。一次成形体130的锥形卡定部33接触外周模具80的第一锥形面82，限制了一次成形体130相对于外周模具80向轴线方向下方的移动。此时，一次成形体130的厚壁筒部34接触外周模具80的圆筒内周面81。也就是说，外周模具80使外周模具80的第一锥形面82在轴线方向上卡定于一次成形体130的锥形卡定部33，并且支承一次成形体130的锥形卡定部33和厚壁筒部34的外周面。Next, as shown in FIG. 9 , the primary molded body 130 is set on the peripheral mold 80 after the mold disposing process (S3 in FIG. 7: "primary molded body disposing process"). The tapered locking portion 33 of the primary forming body 130 contacts the first tapered surface 82 of the outer peripheral mold 80 to restrict the movement of the primary forming body 130 relative to the outer peripheral mold 80 in the axial direction downward. At this time, the thick cylindrical portion 34 of the primary molded body 130 contacts the cylindrical inner peripheral surface 81 of the outer peripheral mold 80 . That is, the outer peripheral mold 80 locks the first tapered surface 82 of the outer peripheral mold 80 to the tapered locking portion 33 of the primary molded body 130 in the axial direction, and supports the tapered locking portion 33 of the primary molded body 130 And the outer peripheral surface of the thick-walled cylindrical portion 34 .

此时，外周模具80的第二锥形面83和反熔接面形成部85处于不与一次成形体130的被成形部130a接触的状态。并且，在配置一次成形体130时，外周模具80被设为预定温度。在本实施方式中，预定温度是常温(室温)、例如是25℃左右。也就是说，外周模具80在该时刻不被加热。At this time, the second tapered surface 83 of the outer peripheral mold 80 and the anti-welding surface forming portion 85 are in a state of not being in contact with the portion to be molded 130 a of the primary molded body 130 . Furthermore, when arranging the primary molded body 130, the outer peripheral mold 80 is set at a predetermined temperature. In the present embodiment, the predetermined temperature is normal temperature (room temperature), for example, about 25°C. That is, the peripheral mold 80 is not heated at this time.

接着，如图10所示，在一次成形体配置工序之后，使内周模具90的温度高于外周模具80的温度。内周模具90的温度是以下这样的温度，即：在使内周模具90与一次成形体130接触的状态下，能够柔软到能将凸缘部35的至少内层35a的对应部位扩张成形的程度，并且，能维持构成凸缘部35的各层35a～35e的对应部位的多层结构。在本实施方式中，内周模具90的温度是比中间层35b的软化点低得多的温度。Next, as shown in FIG. 10 , the temperature of the inner peripheral mold 90 is made higher than the temperature of the outer peripheral mold 80 after the primary molding arrangement step. The temperature of the inner peripheral mold 90 is such a temperature that, in a state where the inner peripheral mold 90 is in contact with the primary molded body 130, it is soft enough to expand and mold at least the corresponding portion of the inner layer 35a of the flange portion 35. Moreover, the multilayer structure of the corresponding parts of the respective layers 35a to 35e constituting the flange portion 35 can be maintained. In this embodiment, the temperature of the inner peripheral mold 90 is much lower than the softening point of the intermediate layer 35b.

然后，使高温的内周模具90接近外周模具80，将内周模具90的第二锥形面94从一次成形体130的被成形部130a的开口插入。并且，使内周模具90接近外周模具80，如图10所示，使内周模具90的圆筒面93在一次成形体130的被成形部130a的全长范围内与该被成形部130a接触。通过将该状态维持预定时间，能够将一次成形体130的被成形部130a加温(图7中的S4：“加温工序”)。此时，构成凸缘部35的所有的层35a～35e的对应部位不会软化而混合，在维持多层结构的同时特别使内层35a的对应部位变柔软。Then, the high-temperature inner peripheral mold 90 is brought close to the outer peripheral mold 80 , and the second tapered surface 94 of the inner peripheral mold 90 is inserted through the opening of the portion to be molded 130 a of the primary molded body 130 . And, make the inner peripheral mold 90 close to the outer peripheral mold 80, as shown in FIG. . By maintaining this state for a predetermined time, the portion to be molded 130 a of the primary molded body 130 can be heated ( S4 in FIG. 7 : "heating step"). At this time, the corresponding parts of all the layers 35a to 35e constituting the flange part 35 are mixed without being softened, and the corresponding parts of the inner layer 35a are especially softened while maintaining the multilayer structure.

此时，外周模具80位于不与被成形部130a接触的位置。并且，外周模具80在该时刻也仍是常温。因此，一次成形体130被内周模具90加温，但不会被外周模具80加温。At this time, the outer peripheral mold 80 is located at a position where it does not come into contact with the portion to be formed 130a. In addition, the peripheral mold 80 is still at normal temperature at this time. Therefore, the primary molded body 130 is heated by the inner peripheral mold 90 but is not heated by the outer peripheral mold 80 .

接着，如图11所示，在加温工序之后使内周模具90进一步接近外周模具80，使内周模具90向下方移动，直到外周模具80的止挡平面84和内周模具90的主体部91的熔接面形成部91a接触的状态。内周模具90从加温工序的位置向与外周模具80接触的位置移动。并且，内周模具90在与外周模具80接触的位置维持预定时间。Next, as shown in FIG. 11 , the inner peripheral mold 90 is further approached to the outer peripheral mold 80 after the heating process, and the inner peripheral mold 90 is moved downward until the stop plane 84 of the outer peripheral mold 80 and the main body of the inner peripheral mold 90 91 in a state where the welded surface forming portion 91a is in contact with each other. The inner peripheral mold 90 moves from the position of the heating step to the position in contact with the outer peripheral mold 80 . And, the inner peripheral mold 90 is maintained at a position in contact with the outer peripheral mold 80 for a predetermined time.

也就是说，一次成形体130的被成形部130a沿着内周模具90的第一锥形面92和熔接面形成部91a变形，利用内周模具90的第一锥形面92和熔接面形成部91a及外周模具80的第二锥形面83和反熔接面形成部85扩张成形凸缘部35(图7中的S5：“扩张成形工序”)。That is to say, the formed portion 130a of the primary molded body 130 deforms along the first tapered surface 92 of the inner peripheral mold 90 and the welded surface forming portion 91a, and is formed by the first tapered surface 92 of the inner peripheral mold 90 and the welded surface. The second tapered surface 83 of the part 91 a and the outer peripheral mold 80 and the anti-welding surface forming part 85 are expanded to form the flange part 35 (S5 in FIG. 7: "expanded forming process").

详细地讲，首先，内周模具90的第一锥形面92接触一次成形体130的被成形部130a的内周面，并且使一次成形体130的被成形部130a沿着第二锥形面83扩径变形。并且，当内周模具90的熔接面形成部91a接触一次成形体130的被成形部130a的端部时，内周模具90的熔接面形成部91a使一次成形体130的被成形部130a沿着熔接面形成部91a进一步扩径变形。In detail, first, the first tapered surface 92 of the inner peripheral mold 90 contacts the inner peripheral surface of the portion to be molded 130a of the primary molded body 130, and the portion to be molded 130a of the primary molded body 130 is formed along the second tapered surface. 83 expansion deformation. And, when the welding surface forming portion 91a of the inner peripheral mold 90 contacts the end portion of the portion to be formed 130a of the primary molded body 130, the welding surface forming portion 91a of the inner peripheral mold 90 makes the portion to be molded 130a of the primary molded body 130 along the The welded surface forming portion 91a is further deformed to expand in diameter.

于是，一次成形体130的被成形部130a的一部分在径向上被夹在外周模具80的第二锥形面83和内周模具90的第一锥形面92之间，从而形成凸缘部35的锥形部71。此外，一次成形体130的被成形部130a的另一部分在轴线方向上被夹在外周模具80的反熔接面形成部85和内周模具90的熔接面形成部91a之间，从而形成凸缘部35的圆环板部72。Then, a part of the portion to be formed 130 a of the primary molded body 130 is sandwiched between the second tapered surface 83 of the outer peripheral mold 80 and the first tapered surface 92 of the inner peripheral mold 90 in the radial direction, thereby forming the flange portion 35 The tapered portion 71. Further, another part of the formed portion 130a of the primary molded body 130 is sandwiched between the anti-welding surface forming portion 85 of the outer peripheral mold 80 and the welding surface forming portion 91a of the inner peripheral mold 90 in the axial direction, thereby forming a flange portion. 35 of the annular plate portion 72 .

而且，在加温工序中，利用内周模具90将被成形部130a的内层侧加温，因此，被成形部130a的内层侧变柔软，外层侧与内层相比不易变柔软。因此，被成形部130a的内层侧是易于流动的状态，但外层侧成为比较不易流动的状态。Furthermore, in the heating step, the inner layer side of the portion to be molded 130a is heated by the inner peripheral mold 90, so the inner layer side of the portion to be molded 130a becomes soft, and the outer layer side is less likely to become softer than the inner layer. Therefore, the inner layer side of the portion to be formed 130a is in a state of easy flow, but the outer layer side is in a state of relatively difficult flow.

因而，在将一次成形体130的被成形部130a扩张成形时，易于流动的内层欲向重量方向下方流动。但是，在将与凸缘部35的圆环板部72相当的部位扩张成形时，由于一次成形体130的内层位于重力方向上方，因此，不会达到例如朝向外周模具80的反熔接面形成部85的底面流动的程度。因而，能够可靠地形成凸缘部35。Therefore, when the molded portion 130a of the primary molded body 130 is expanded and molded, the easily flowable inner layer tends to flow downward in the weight direction. However, when the portion corresponding to the annular plate portion 72 of the flange portion 35 is expanded and molded, since the inner layer of the primary molded body 130 is located above the direction of gravity, for example, the anti-welding surface formation toward the outer peripheral mold 80 cannot be achieved. The degree to which the bottom surface of the portion 85 flows. Therefore, the flange portion 35 can be reliably formed.

在此，在像上述那样利用外周模具80和内周模具90扩张成形凸缘部35时，内周模具90产生将一次成形体130的被成形部130a向轴线方向下方按压的力。该力也被传递到外周模具80和一次成形体130之间。倘若一次成形体130相对于外周模具80在轴线方向上产生错位，则无法在期望位置形成凸缘部35。因此，在内周模具90将一次成形体130的被成形部130a扩张成形时，需要外周模具80保持一次成形体130的轴线方向位置。Here, when the flange portion 35 is expanded and molded by the outer peripheral mold 80 and the inner peripheral mold 90 as described above, the inner peripheral mold 90 generates a force that presses the molded portion 130 a of the primary molded body 130 downward in the axial direction. This force is also transmitted between the peripheral mold 80 and the primary molded body 130 . If the primary molded body 130 is misaligned in the axial direction with respect to the outer peripheral mold 80, the flange portion 35 cannot be formed at a desired position. Therefore, when the inner peripheral mold 90 expands and molds the portion 130 a of the primary molded body 130 , it is necessary for the outer peripheral mold 80 to maintain the axial position of the primary molded body 130 .

因此，通过一次成形体130的锥形卡定部33和外周模具80的第一锥形面82互相卡定，从而外周模具80保持一次成形体130的轴线方向位置。在此，外周模具80和一次成形体130之间的卡定力取决于两者的摩擦力。因此，两者的温度越高，则摩擦力越下降。Therefore, the outer peripheral mold 80 maintains the axial position of the primary molded body 130 because the tapered engaging portion 33 of the primary molded body 130 and the first tapered surface 82 of the outer peripheral mold 80 engage with each other. Here, the locking force between the outer peripheral mold 80 and the primary molded body 130 depends on the frictional force between them. Therefore, the higher the temperature of both, the lower the frictional force.

但是，在扩张成形工序中，外周模具80毕竟不是被积极地加温。通过内周模具90接近外周模具80，从而内周模具90的热经由一次成形体130被传递。但是，即使是热被传递到外周模具80的状态，外周模具80的温度也比内周模具90的温度低得多。因此，外周模具80和一次成形体130之间的摩擦力变得足够高，外周模具80和一次成形体130的轴线方向上的相对位置不易产生偏移。因而，能在期望的位置扩张成形凸缘部35。However, in the expansion molding step, the outer peripheral mold 80 is not actively heated after all. As the inner peripheral mold 90 approaches the outer peripheral mold 80 , the heat of the inner peripheral mold 90 is transferred via the primary molded body 130 . However, even in a state where heat is transferred to the outer peripheral mold 80 , the temperature of the outer peripheral mold 80 is much lower than that of the inner peripheral mold 90 . Therefore, the frictional force between the outer peripheral mold 80 and the primary molded body 130 becomes sufficiently high, and the relative positions in the axial direction of the outer peripheral mold 80 and the primary molded body 130 are less likely to deviate. Accordingly, the flange portion 35 can be expanded and molded at a desired position.

接着，如图11所示，在一次成形体130被外周模具80和内周模具90夹持的状态下，自冲压装置主体(未图示)拆卸。拆下来的单元130、80、90被放入到预定温度的槽中预定时间，从而对一次成形体130进行整体加热处理(图7中的S6：“整体加热处理工序”)。在该情况下，与上述的加温工序和扩张成形工序时不同，加热一次成形体130整体。利用该整体加热处理能够去除一次成形体130的内部应力。Next, as shown in FIG. 11 , the primary molded body 130 is detached from the press device main body (not shown) in a state where the outer peripheral die 80 and the inner peripheral die 90 are clamped. The disassembled units 130, 80, 90 are placed in a tank at a predetermined temperature for a predetermined time, thereby performing the overall heat treatment on the primary molded body 130 (S6 in FIG. 7: "overall heat treatment process"). In this case, unlike the above-mentioned heating step and expansion molding step, the entire primary molded body 130 is heated. The internal stress of the primary molded body 130 can be removed by this overall heat treatment.

接着，在一次成形体130被外周模具80和内周模具90夹持的状态下进行冷却(图7中的S7：“冷却工序”)，将外周模具80和内周模具90自一次成形体130拆下(图7中的S8：“脱模工序”)。这样，完成二次成形体(图7中的S2～S8：“二次成形工序”)。Next, the primary molded body 130 is cooled in a state clamped by the outer peripheral mold 80 and the inner peripheral mold 90 (S7 in FIG. Remove (S8 in Fig. 7: "Demoulding process"). In this way, the secondary molded body is completed (S2 to S8 in FIG. 7: "secondary molding process").

接着，利用弯曲成形机(未图示)对二次成形体进行弯曲部62b的弯曲成形(图7中的S9：“弯曲工序”)。在弯曲工序中，在将芯棒(未图示)插入到加料管30的内部的状态下，将非压入基本部62的外周面按压于按压构件(未图示)，从而成形弯曲部62b。于是，完成加料管30。另外，压入基本部61在该时刻是与非压入基本部62的第一直线部62a相同的形状。像上述那样，通过供油口20的插入部21插入到压入基本部61，从而压入基本部61扩径。Next, the secondary molded body is subjected to bending forming of the bent portion 62b using a bending machine (not shown) (S9 in FIG. 7: "bending step"). In the bending process, in a state where a mandrel (not shown) is inserted into the feeding tube 30, the outer peripheral surface of the non-press-fit base portion 62 is pressed against a pressing member (not shown), thereby forming the bent portion 62b. . Thus, the feed pipe 30 is completed. In addition, the press-fit base portion 61 has the same shape as the first straight line portion 62 a of the non-press-fit base portion 62 at this time. As mentioned above, the insertion part 21 passing through the oil supply port 20 is inserted into the press-fit base part 61, and the diameter of the press-fit base part 61 expands.

此外，并不限定于上述的工序顺序，也可以在S5的“扩张成形工序”之后进行S9的“弯曲工序”，在S6的“整体加热处理工序”中的一次成形体130的整体加热处理时，同时进行弯曲部62b的弯曲成形。在该情况下，在预定温度的槽内，在一次成形体130的端部被外周模具80和内周模具90夹持的状态下进行弯曲部62b的弯曲成形即可。In addition, the sequence of steps is not limited to the above, and the "bending step" of S9 may be performed after the "expansion molding step" of S5. , and at the same time perform the bending forming of the bending portion 62b. In this case, bending of the bent portion 62 b may be performed in a state where the end portion of the primary molded body 130 is sandwiched between the outer peripheral mold 80 and the inner peripheral mold 90 in a tank at a predetermined temperature.

(4.实施方式的效果)(4. Effects of Embodiment)

上述的加料管30是热塑性树脂制，其能熔接于燃料箱10的开口部11。熔接之前的加料管30包括：基本部31，其总壁厚为2mm～4mm，呈非波纹形筒状；波纹管部32，其总壁厚为0.5mm～3mm；以及凸缘部35，其总壁厚为3.5mm～5mm，且具有能熔接于燃料箱10的端面。The aforementioned feed pipe 30 is made of thermoplastic resin, and can be welded to the opening 11 of the fuel tank 10 . The feeding pipe 30 before welding includes: a basic part 31, whose total wall thickness is 2 mm to 4 mm, in a non-corrugated cylindrical shape; a bellows part 32, whose total wall thickness is 0.5 mm to 3 mm; and a flange part 35, whose The total wall thickness is 3.5 mm to 5 mm, and has an end face that can be welded to the fuel tank 10 .

基本部31、波纹管部32以及凸缘部35包括：内层31a、32a、35a，其形成为总壁厚的40％～60％的厚度且将高密度聚乙烯(HDPE)作为主体；中间层31b、32b、35b，其配置在内层31a、32a、35a的外周侧且具有耐燃料透过特性；以及外层31c、32c、35c，其配置在中间层31b、32b、35b的外周侧，用于保护中间层31b、32b、35b。The base part 31, the bellows part 32, and the flange part 35 include: inner layers 31a, 32a, 35a formed to a thickness of 40% to 60% of the total wall thickness and mainly made of high-density polyethylene (HDPE); Layers 31b, 32b, 35b, which are arranged on the outer peripheral side of the inner layers 31a, 32a, 35a and have fuel permeation resistance properties; and outer layers 31c, 32c, 35c, which are arranged on the outer peripheral side of the intermediate layers 31b, 32b, 35b , for protecting the intermediate layers 31b, 32b, 35b.

HDPE与树脂制的燃料箱10之间的熔接性能良好。而且，凸缘部35将其总壁厚T5形成为3.5mm～5mm，具有总壁厚T5的40％以上厚度的内层35a形成为将HDPE作为主体。凸缘部35的内层35a是位于端面、与燃料箱10接触的部位。也就是说，凸缘部35的内层35a具有能够确保所需要的熔接强度的程度的厚度。The welding performance between HDPE and the fuel tank 10 made of resin is good. Furthermore, the flange portion 35 has a total thickness T5 of 3.5 mm to 5 mm, and the inner layer 35 a having a thickness of 40% or more of the total thickness T5 is mainly formed of HDPE. The inner layer 35 a of the flange portion 35 is a portion located on the end surface and in contact with the fuel tank 10 . That is, the inner layer 35a of the flange portion 35 has a thickness sufficient to ensure the required weld strength.

此外，在凸缘部35中，存在于燃料箱10的表面和凸缘部35的中间层35b之间的内层35a与中间层35b相比，耐燃料透过特性较低。但是，凸缘部35的内层35a是总壁厚T5的60％以下的厚度。因而，在凸缘部35的内层35a熔接于燃料箱10的状态下，凸缘部35的内层35a的厚度足够小。因此，在凸缘部35的内层35a的部位能够充分地确保耐燃料透过特性。In addition, in the flange portion 35 , the inner layer 35 a present between the surface of the fuel tank 10 and the intermediate layer 35 b of the flange portion 35 has lower fuel permeation resistance properties than the intermediate layer 35 b. However, the inner layer 35a of the flange portion 35 has a thickness of 60% or less of the total thickness T5. Therefore, in a state where the inner layer 35 a of the flange portion 35 is welded to the fuel tank 10 , the thickness of the inner layer 35 a of the flange portion 35 is sufficiently small. Therefore, sufficient fuel permeation resistance can be ensured at the portion of the inner layer 35 a of the flange portion 35 .

此外，基本部31将其总壁厚T1形成为2mm～4mm。因而，基本部31可靠地具有所要求的耐冲击性。另一方面，波纹管部32将其总壁厚T2形成为0.5mm～3mm。而且，波纹管部32薄于基本部31。因此，波纹管部32具有良好的弯曲性，因此能够使加料管30的配设容易化。但是，由于波纹管部32的总壁厚T2薄于基本部31的总壁厚，因此该波纹管部32的耐冲击性能较低。但是，通过在不那么需要耐冲击性的位置且是要求弯曲配置的位置处配置波纹管部32就足矣。In addition, the base portion 31 is formed to have a total thickness T1 of 2 mm to 4 mm. Therefore, the base portion 31 reliably has the required impact resistance. On the other hand, the bellows portion 32 has a total thickness T2 of 0.5 mm to 3 mm. Also, the bellows portion 32 is thinner than the base portion 31 . Therefore, since the bellows portion 32 has good bendability, the arrangement of the feeding tube 30 can be facilitated. However, since the total wall thickness T2 of the bellows portion 32 is thinner than the total wall thickness of the base portion 31, the bellows portion 32 has low impact resistance. However, it is sufficient to dispose the bellows portion 32 at a position where impact resistance is not so required and where a bent arrangement is required.

此外，中间层31b、32b、34b、35b形成为将乙烯-乙烯醇共聚物(EVOH)和聚酰胺(PA)系中的任一者作为主体，外层31c、32c、34c、35c形成为将高密度聚乙烯(HDPE)和聚酰胺(PA)系中的任一者作为主体。由此，可靠地具有中间层31b、32b、34b、35b所要求的耐燃料透过特性和外层31c、32c、34c、35c所要求的耐冲击性等。In addition, the intermediate layers 31b, 32b, 34b, and 35b are formed mainly of any one of ethylene-vinyl alcohol copolymer (EVOH) and polyamide (PA), and the outer layers 31c, 32c, 34c, and 35c are formed of Either one of high-density polyethylene (HDPE) and polyamide (PA) is used as the main body. Accordingly, the fuel permeation resistance required for the intermediate layers 31b, 32b, 34b, and 35b and the impact resistance required for the outer layers 31c, 32c, 34c, and 35c are reliably provided.

此外，加料管30具备总壁厚T4是4mm～6mm的非波纹状的厚壁筒部34，凸缘部35自厚壁筒部34的靠燃料箱10侧的一端向径向外侧突出。由此，在扩张成形凸缘部35的情况下，凸缘部35和厚壁筒部34之间的交界部位能够维持具有足够强度的状态。此外，在将凸缘部35熔接于燃料箱10时，通过对厚壁筒部34赋予轴力，从而凸缘部35能够可靠地熔接于燃料箱10。而且，即使对厚壁筒部34赋予轴力，由于厚壁筒部34足够厚，因此，厚壁筒部34不会纵向弯曲，能够可靠地向凸缘部35传递轴力。In addition, the feed pipe 30 has a non-corrugated thick tube portion 34 with a total thickness T4 of 4 mm to 6 mm, and a flange portion 35 protrudes radially outward from one end of the thick tube portion 34 on the fuel tank 10 side. Accordingly, when the flange portion 35 is expanded and formed, the boundary portion between the flange portion 35 and the thick cylindrical portion 34 can be maintained in a state having sufficient strength. In addition, when the flange portion 35 is welded to the fuel tank 10 , by applying an axial force to the thick cylindrical portion 34 , the flange portion 35 can be reliably welded to the fuel tank 10 . Furthermore, even if an axial force is applied to the thick cylindrical portion 34 , since the thick cylindrical portion 34 is sufficiently thick, the thick cylindrical portion 34 does not bend longitudinally, and the axial force can be reliably transmitted to the flange portion 35 .

此外，凸缘部35形成得比厚壁筒部34薄。由此，能够使凸缘部35的内层35a的厚度在能够确保熔接强度的范围内足够小，并且，能够在厚壁筒部34不纵向弯曲的情况下向凸缘部35传递轴力。也就是说，能够在使耐燃料透过特性良好的同时可靠地与燃料箱10熔接。In addition, the flange portion 35 is formed thinner than the thick cylindrical portion 34 . Thereby, the thickness of the inner layer 35a of the flange portion 35 can be sufficiently reduced within a range in which the welding strength can be ensured, and the axial force can be transmitted to the flange portion 35 without the thick cylindrical portion 34 being bent longitudinally. That is, it is possible to reliably weld to the fuel tank 10 while making the fuel permeation resistance property good.

此外，凸缘部35包括从厚壁筒部34的靠燃料箱10侧的一端进行扩径的锥形部71和从锥形部71的靠燃料箱10侧的一端向径向外侧延伸的圆环板部72。在该情况下，圆环板部72成为能熔接于燃料箱10的部位。而且，锥形部71存在于厚壁筒部34和圆环板部72之间。因而，能够吸收厚壁筒部34和圆环板部72之间的厚度差。也就是说，在厚壁筒部34和圆环板部72之间不会产生急剧的厚度差，因此，能够确保较高的熔接强度。In addition, the flange portion 35 includes a tapered portion 71 that expands in diameter from one end of the thick-walled cylindrical portion 34 on the fuel tank 10 side, and a circle extending radially outward from the end of the tapered portion 71 on the fuel tank 10 side. Ring plate portion 72 . In this case, the annular plate portion 72 becomes a portion capable of being welded to the fuel tank 10 . Also, the tapered portion 71 exists between the thick-walled cylindrical portion 34 and the annular plate portion 72 . Thus, a difference in thickness between the thick-walled cylindrical portion 34 and the annular plate portion 72 can be absorbed. That is, since there is no sharp difference in thickness between the thick cylindrical portion 34 and the annular plate portion 72 , high welding strength can be ensured.

此外，锥形部71和圆环板部72形成得比厚壁筒部34薄，圆环板部72形成得比锥形部71薄。由此，能够可靠地防止在厚壁筒部34和圆环板部72之间产生急剧的厚度差。因而，能够可靠地确保较高的熔接强度。In addition, the tapered portion 71 and the annular plate portion 72 are formed thinner than the thick tube portion 34 , and the annular plate portion 72 is formed thinner than the tapered portion 71 . Accordingly, it is possible to reliably prevent a sharp difference in thickness from occurring between the thick cylindrical portion 34 and the annular plate portion 72 . Therefore, high welding strength can be ensured reliably.

此外，加料管30具备作为基本部31的一部分的箱侧基本部63，该箱侧基本部63连接设置在波纹管部32的靠燃料箱10侧的一端，并且，设置在厚壁筒部34的与燃料箱10所处侧相反的那一侧。箱侧基本部63具有连接波纹管部32和厚壁筒部34的作用。也就是说，箱侧基本部63具有缓和波纹管部32和厚壁筒部34之间的厚度的急剧变化的作用。In addition, the charging pipe 30 is provided with a tank-side base portion 63 as a part of the base portion 31 . The side opposite to the side where the fuel tank 10 is located. The tank-side base portion 63 has a role of connecting the bellows portion 32 and the thick-walled cylindrical portion 34 . That is, the tank-side base portion 63 has a function of alleviating a sharp change in thickness between the bellows portion 32 and the thick-walled cylindrical portion 34 .

此外，箱侧基本部63具备以环状向径向外侧突出的肋63a。特别是，通过箱侧基本部63具有肋63a，即使箱侧基本部63的轴线方向长度较短，也能够可靠地缓和厚度的急剧变化。Furthermore, the box-side base portion 63 includes a rib 63 a protruding radially outward in an annular shape. In particular, since the case-side base portion 63 has the rib 63a, even if the axial length of the case-side base portion 63 is short, it is possible to reliably moderate a sudden change in thickness.

此外，加料管30包括：压入基本部61，其作为基本部31的一部分，设置在加料管30的靠与燃料箱10所处侧相反的那一侧的一端，该压入基本部61是供作为对方构件的供油口20的插入部21压入到内部的部位；以及非压入基本部62，其作为基本部31的一部分，与压入基本部61相连接地设置。In addition, the charging pipe 30 includes: a press-in basic part 61, which is a part of the basic part 31, and is provided at one end of the charging pipe 30 on the side opposite to the side where the fuel tank 10 is located, and the press-in basic part 61 is A portion into which the insertion portion 21 of the oil supply port 20 as a counterpart member is press-fitted; and a non-press-fit base portion 62 , which is a part of the base portion 31 and is provided in a continuous manner with the press-fit base portion 61 .

在插入部21未插入到压入基本部61的状态下，像上述那样不存在压入基本部61和非压入基本部62之间的明确的交界。因此，在将加料管30配设于汽车上时，能够调整加料管30的端部位置。也就是说，即使略微切断了加料管30的靠供油口20侧的端部，也能够在加料管30的端侧确保供供油口20的插入部21插入的长度。因而，能够充分地确保压入基本部61的长度。在该情况下，只是非压入基本部62的长度变得稍短。这样，就加料管30的配设而言，端部位置调整变容易。In a state where the insertion portion 21 is not inserted into the press-fit base portion 61 , there is no clear boundary between the press-fit base portion 61 and the non-press-fit base portion 62 as described above. Therefore, when the filler pipe 30 is arranged on the vehicle, the position of the end of the filler pipe 30 can be adjusted. That is, even if the end portion of the fuel supply pipe 30 on the fuel supply port 20 side is slightly cut off, a length for inserting the insertion portion 21 of the fuel supply port 20 can be ensured at the end side of the fuel supply pipe 30 . Therefore, the length of the press-fit base portion 61 can be sufficiently ensured. In this case, only the length of the non-press-fit base portion 62 becomes slightly shorter. In this way, in terms of the arrangement of the feed pipe 30, the end position adjustment becomes easy.

此外，非压入基本部62具备中心轴线弯曲的弯曲部62b。加料管30具有中心轴线弯曲的部位。其一部分是波纹管部32。但是，并非是将所有弯曲的部位都作为波纹管部32，在接近供油口20的一侧为非波纹形筒状的基本部31而不是波纹管部32，从而液体燃料的流通变良好。In addition, the non-press-fit base portion 62 includes a bent portion 62b whose central axis is bent. The feed pipe 30 has a portion where the central axis is bent. A part thereof is the bellows portion 32 . However, not all the bent portions are bellows 32, and the non-corrugated cylindrical basic portion 31 is not the bellows 32 on the side close to the fuel supply port 20, so that the flow of liquid fuel becomes better.

此外，上述实施方式的加料管30的制造方法包括一次成形工序(S1)和二次成形工序(S2～S8)，在一次成形工序中，使用波纹模具利用波纹成形来成形一次成形体130，在二次成形工序中，通过使用外周模具80和内周模具90对一次成形体130实施冲压加工来成形加料管30。In addition, the manufacturing method of the feeding pipe 30 in the above-mentioned embodiment includes a primary forming step (S1) and a secondary forming step (S2-S8). In the secondary forming process, the feeding tube 30 is formed by pressing the primary molded body 130 using the outer peripheral mold 80 and the inner peripheral mold 90 .

而且，二次成形工序(S2～S8)包括：一次成形体配置工序(S3)，在该工序中，以设为预定温度的外周模具80支承一次成形体130的厚壁筒部34的外周面的方式将一次成形体130配置于外周模具80；以及扩张成形工序(S5)，在该工序中，在一次成形体配置工序(S3)之后将设为比外周模具80的预定温度高的温度的内周模具90插入到被成形部130a的内周侧，并且，使外周模具80和内周模具90在轴线方向上相对移动而使外周模具80的端面和内周模具90在轴线方向上夹持被成形部130a，从而扩张成形凸缘部35。Further, the secondary molding process (S2 to S8) includes a primary molded body arrangement step (S3) in which the outer peripheral surface of the thick-walled cylindrical portion 34 of the primary molded body 130 is supported by the outer peripheral mold 80 set to a predetermined temperature. disposing the primary molded body 130 on the outer peripheral mold 80 in a manner; The inner peripheral mold 90 is inserted into the inner peripheral side of the part to be formed 130a, and the end surface of the outer peripheral mold 80 and the inner peripheral mold 90 are sandwiched in the axial direction by relatively moving the outer peripheral mold 80 and the inner peripheral mold 90 in the axial direction. The formed portion 130a is expanded to form the flange portion 35 .

通过将一次成形体130的筒状的被成形部130a扩张成形，能够成形凸缘部35。此时，使用支承加料管30外周侧的外周模具80和支承加料管30内周侧的内周模具90。在此，在扩张成形工序(S5)中，内周模具90被设为其温度比外周模具80的温度高。也就是说，一次成形体130的被成形部130a被内周模具90加温，成为易于扩张成形的状态。The flange portion 35 can be molded by expanding and molding the cylindrical to-be-molded portion 130 a of the primary molded body 130 . At this time, the outer peripheral die 80 supporting the outer peripheral side of the feeding tube 30 and the inner peripheral die 90 supporting the inner peripheral side of the feeding tube 30 are used. Here, in the expansion molding step ( S5 ), the temperature of the inner peripheral mold 90 is set to be higher than the temperature of the outer peripheral mold 80 . That is, the portion to be formed 130 a of the primary molded body 130 is heated by the inner peripheral mold 90 to be in a state where it is easy to expand and form.

另一方面，外周模具80在扩张成形工序(S5)中温度比内周模具90的温度低。该外周模具80是在扩张成形工序(S5)之前供一次成形体130配置的模具。也就是说，在扩张成形工序(S5)中，即使内周模具90相对地设为高温，由于外周模具80是低温，因此，一次成形体130的与外周模具80接触的部位也不会成为易于变形的状态，外周模具80和一次成形体130之间的相对位置不易产生偏移。因而，能够在期望的位置扩张成形凸缘部35。On the other hand, the temperature of the outer peripheral mold 80 is lower than that of the inner peripheral mold 90 in the expansion molding step ( S5 ). The outer peripheral mold 80 is a mold for disposing the primary molded body 130 before the expansion molding step ( S5 ). That is, in the expansion molding step (S5), even if the inner peripheral mold 90 is set at a relatively high temperature, since the outer peripheral mold 80 is at a low temperature, the portion of the primary molded body 130 that is in contact with the outer peripheral mold 80 will not become easily In the deformed state, the relative position between the outer peripheral mold 80 and the primary molded body 130 is less likely to deviate. Accordingly, the flange portion 35 can be expanded and molded at a desired position.

附图标记说明Explanation of reference signs

1、燃料管线；10、燃料箱；11、开口部；20、供油口；21、插入部；30、加料管；31、基本部；31a、32a、34a、35a、内层；31b、32b、34b、35b、中间层；31c、32c、34c、35c、外层；32、波纹管部；33、锥形卡定部；34、厚壁筒部；35、凸缘部；61、压入基本部；62、非压入基本部；62b、弯曲部；63、箱侧基本部；63a、肋；71、锥形部；72、圆环板部；80、外周模具；90、内周模具；130、一次成形体；130a、被成形部。1. Fuel pipeline; 10. Fuel tank; 11. Opening part; 20. Oil supply port; 21. Insertion part; 30. Feeding pipe; 31. Basic part; 31a, 32a, 34a, 35a, inner layer; 31b, 32b , 34b, 35b, middle layer; 31c, 32c, 34c, 35c, outer layer; 32, bellows part; 33, tapered locking part; 34, thick-walled tube part; 35, flange part; 61, press-in Basic part; 62, non-pressed basic part; 62b, curved part; 63, box side basic part; 63a, rib; 71, tapered part; 72, ring plate part; 80, outer peripheral mold; 90, inner peripheral mold ; 130, a primary forming body; 130a, the part to be formed.

Claims (11)

1. a kind of charge pipe, it is charge pipe of the energy welding in the thermoplastic resin of the opening portion of fuel tank, wherein,
The charge pipe before welding includes：
Basic portion, its total wall thickness is 2mm~4mm, in non-corrugated tubular；
Bellows portion, its total wall thickness is 0.5mm~3mm；And
Flange part, its total wall thickness is 3.5mm~5mm, and with the end face of the fuel tank can be fused to,
The basic portion, the bellows portion and the flange part include：
Internal layer, it is formed as 40%~60% thickness of total wall thickness and regard high density polyethylene (HDPE) (HDPE) as main body；
Intermediate layer, it configures the outer circumferential side in the internal layer and passes through characteristic with fuel-resistant；And
Outer layer, it configures the outer circumferential side in the intermediate layer, for protecting the intermediate layer.
2. charge pipe according to claim 1, wherein,
The intermediate layer is formed as regarding any one of ethylene-vinyl alcohol copolymer (EVOH) and polyamide (PA) system as master Body,
The outer layer is formed as regarding any one of high density polyethylene (HDPE) (HDPE) and polyamide (PA) system as main body.
3. charge pipe according to claim 1 or 2, wherein,
The charge pipe includes the non-undulatory thick cylinder portion that total wall thickness is 4mm~6mm,
The flange part is prominent to radial outside from the one end by the fuel tank side in the thick cylinder portion.
4. charge pipe according to claim 3, wherein,
The flange part is formed must be thinner than the thick cylinder portion.
5. charge pipe according to claim 4, wherein,
The flange part includes：
Tapered portion, it carries out expanding from the one end by the fuel tank side in the thick cylinder portion；And
Annulus plate portion, it extends from one end by the fuel tank side of the tapered portion to radial outside.
6. charge pipe according to claim 5, wherein,
The tapered portion and the annulus plate portion are formed must be thinner than the thick cylinder portion,
The annulus plate portion is formed must be thinner than the tapered portion.
7. the charge pipe according to any one of claim 3~6, wherein,
The charge pipe includes case side base our department of the part as the basic portion, and case side base our department connection is arranged on institute State one end by the fuel tank side of bellows portion, also, be arranged on the thick cylinder portion with side residing for the fuel tank That opposite side.
8. charge pipe according to claim 7, wherein,
Described case side base our department is included with the ring-type rib prominent to radial outside.
9. according to charge pipe according to any one of claims 1 to 8, wherein,
The charge pipe includes：
Be pressed into basic portion, its as the basic portion a part, be arranged on the charge pipe lean on residing for the fuel tank One end of that opposite side of side, the press-in basic portion is that the position of inside is pressed into for other side's component；And
Non- press-in basic portion, it is as a part for the basic portion, and be connected ground connection setting with the press-in basic portion.
10. charge pipe according to claim 9, wherein,
The non-press-in basic portion includes the bending section that central axis is bent.
11. a kind of method of the charge pipe any one of manufacturing claims 3~8, wherein,
The manufacture method of the charge pipe includes：
Once-forming process, in the process, once-forming body is shaped using corrugation using ripple mould；And
Secondary forming process, in the process, implements to rush by using periphery mould and inner circumferential mould to the once-forming body Pressure processes to shape the charge pipe,
The once-forming body includes the portion that is formed of the basic portion, the bellows portion, the thick cylinder portion and tubular, The portion of being formed is the position before expanding the shaping flange part,
The secondary forming process includes：
Once-forming body arrangement step, in the process, be set to predetermined temperature the periphery mould support described in once into The once-forming body is configured at the periphery mould by the mode of the outer peripheral face in the thick cylinder portion of body；And
Forming process is expanded, in the process, will be set to than the periphery mould after the once-forming body arrangement step The inner circumferential mould of the high temperature of the predetermined temperature be inserted into the inner circumferential side in the portion that is formed, also, make described outer All moulds and the inner circumferential mould relatively move and make the end face and the inner circumferential mould of the periphery mould in the axial direction Be formed portion described in clamping in the axial direction, so as to expand the shaping flange part.
CN201680004022.2A 2015-09-29 2016-09-02 Feeding tube and method of making the same Active CN107000583B (en)

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US10195936B2 (en) 2019-02-05
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DE112016001416T5 (en) 2017-12-07
CN107000583B (en) 2019-05-10
US20170232838A1 (en) 2017-08-17

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